Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/803fc92901f9
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #17727 from mcav/stopwatch-time-offset

Bug 976439 - [Clock] [Stopwatch] Display time would be trimmed by screen...

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https://hg.mozilla.org/integration/gaia-central/rev/157eeb959dcc
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 976439 - [Clock] [Stopwatch] Display time would be trimmed by screen when over 100 minutes. r=gaye
Bumping manifests a=b2g-bump